A hollow lens is made of thin glass as shown. It can be filled with air, water (n = 1.3) or CS2 (n = 1.6) . The lens will diverge a beam of parallel light if it is filled with: 
A) air and immersed in air
B) air and immersed in water
C) water and immersed in CS2
D) CS2 and immersed in water
E) CS2 and immersed in CS2
Correct Answer:
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